Esquema con los principales elementos en una sinapsis modelo. La sinapsis permite a las células nerviosas comunicarse con otras a través de los axones y dendritas, transformando una señal eléctrica en otra química.
The regulating systems of the human body
Juan Francisco García Biology 10th Grade
Nada hay en la mente que no haya estado antes en los sentidos.(Aristóteles)
NERVOUS SYSTEM Group of organs and tissues that receive, analize and send signals and orders to the rest of the body. The basic unit of the nervous system is the neuron. It´s divided in 2 systems: Central Nervous System (CNS) Peripheral Nervous System (PNS)
NERVOUS CELLS NEURONS: Star-shaped cells, with nucleous, but no cell organelles. PARTS: Cell body Nucleous Axon Axial Dendrites Terminal Dendrites Axon Ending Myelin Sheath
NERVOUS CELLS SCHWANN CELLS: cover the axon and produce myelin. MYELIN: substance with conductive properties that facilitate the transmision of the electrical nervous impulse from one side of the neuron to the other one.
NERVOUS CELLS GLIAL CELLS: non-neuronal cells that maintain homeostasis,form myelin, and provide support and protection for neurons in thebrain, and for neurons in other parts of the nervous system such as in the autonomic nervous. To ToTo surround supply To insulate destroyneurons and nutrients and one neuron pathogens andhold them in oxygen to from another, remove dead place. neurons, neurons.
SYNAPSE It is an specialized intercellular union between neurons or between one neuron and a efector cell.
TYPES OF SYNAPSE ELECTRICAL: Depolarization CHEMICAL Neurotransmitters
Name the colors of the following words. Do NOT read the words...rather, say the color of the words.
BRAIN • FOREBRAIN • MIDBRAIN • HINDBRAIN CENTRAL NERVOUS SYSTEM SPINALNEURONS CORD
BRAIN Major portion of the encephalon Made of 2 substances: white and gray. 2 Hemispheres: Left and Right 4 Lobes: frontal, parietal, temporal and occipital. It coordinates multiple voluntary and advance functions of the body.
LOBES• Judgement • Sensory• Perception Organs• Motor Zone • Kynesic Organs FRONTAL PARIETAL OCCIPITAL TEMPORAL• Sight • Hearing • Near Hippocampus, Smelling
FOREBRAIN MIDBRAIN HINDBRAIN• Receiving and processing sensory • The midbrain and the hindbrain • It extends from the spinal cord and information. together make up the brainstem. contains structures such as• Thinking. • It connects the hindbrain and the the pons and cerebellum.• Perceiving, producing and forebrain. • These regions assist in maintaining understanding language. • This region of the brain is involved balance and equilibrium,• Controlling motor function. in auditory and visual responses as movement coordination, and the well as motor function. conduction of sensory• The forebrain contains structures information. such as the thalamus and hypothalamus. It • The hindbrain also contains the also contains the largest part of the medulla oblongata which is brain, the cerebrum. responsible for controlling such autonomic functions as breathing, heart rate, and digestion.
CEREBELLUM Coordinates de movements of the body. Located in the occipital lobe in the brain. Small size.
THE CORTEX Your brains wrinkled surface is a specialized outer layer of the cerebrum called the cortex. Scientists have "mapped" the cortex by identifying areas strongly linked to certain functions. Specific regions of the cortex: Interpret sensations from your body, and sights, sounds and smells from the outside world. Generate thoughts, solve problems and make plans. Form and store memories. Control voluntary movement.
NEURON FOREST The real work of your brain goes on in individual cells. An adult brain contains about 100 billion nerve cells, or neurons, with branches that connect at more than 100 trillion points. Scientists call this dense, branching network a "neuron forest.“ Signals traveling through the neuron forest form the basis of memories, thoughts, and feelings.